ICD-10 Code H16.042 – Marginal corneal ulcer, left eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H16.042 – Marginal corneal ulcer, left eye
What it is
This code identifies a marginal corneal ulcer affecting the left eye. It means there is a localized ulcer at the edge of the cornea, documented specifically on the left side.
Clinical signs
Typical findings include a peripheral corneal ulcer with pain, redness, tearing, and light sensitivity. Clinical features vary; refer to documentation.
When to use this code
Use H16.042 when the provider documents a marginal corneal ulcer in the left eye. Apply it when the record clearly identifies the ulcer location and laterality. If the note only says “corneal ulcer” without side or margin detail, check documentation.
Do not use for
Do not use this code for ulcers of the right eye, unspecified eye, or non-marginal corneal ulcers. Check documentation if the lesion is described as keratitis, abrasion, or another corneal disorder.
Coding tip
Confirm both laterality and that the ulcer is documented as marginal before assigning H16.042.